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INFORMATION SHEET ORDER NO. R5-2003-0044 -2- <br /> GENERAL ORDER FOR LAND DISPOSAL OF <br /> GROUNDWATER OR SURFACE WATER <br /> FROM CLEANUP OF <br /> PETROLEUM POLLUTION <br /> Effluent limits have been established as follows: <br /> a. 30-Day Median Concentrations for TPH, benzene, ethylbenzene, toluene, xylenes and <br /> MtBE are established as less than the quantitation or reporting limits, that is, less than the <br /> levels that can be quantified for specified, commonly available analytical technology. A <br /> 'median' is used rather than an 'average' or 'arithmetic mean' to allow for the quantitation of <br /> a constituent in individual samples without automatically causing violation of the monthly <br /> limitation, as would occur with an 'average' or'mean' limit. <br /> The current treatment technologies used for groundwater cleanup of petroleum fuel <br /> constituents are not normally subject to sudden upset or bypass, so rapid changes in effluent <br /> quality are not expected. If detectable concentrations of petroleum fuel constituents are <br /> found, the monitoring program requires immediate evaluation of the treatment system and <br /> weekly monitoring of the effluent until less than quantitation (or reporting) limit conditions <br /> are reestablished. The effluent sampling is not a substitute for process control monitoring by <br /> the Discharger. <br /> b. Daily Maximum Effluent Limitations are established to allow for some effluent quality <br /> variation without exceeding water quality objectives. In general, there will not be more than <br /> one sample taken in a month. However, should operational problems require more frequent <br /> monitoring, the daily maximum numbers will enable a discharger to increase the frequency <br /> of monitoring while correcting the operational problems and remain in compliance with <br /> waste discharge requirements. The following table shows water quality objectives and <br /> numerical limits used to interpret the objectives for each monitored constituent. The lowest <br /> of these limits for each chemical is selected as the maximum effluent limitation to comply <br /> with all water quality objectives. Where the lowest limit is lower than the analytical <br /> quantitation limit, the quantitation limit is used as the effluent limit. <br /> Constituent W Q Objective Limit Reference for Limit <br /> /I <br /> Benzene Chemical Constituents 1.0 California Primary MCL <br /> Toxicity 0.15 California Public Health Goal <br /> Taste and odors 170 Taste and Odor Threshold <br /> Ethylbenzene Chemical Constituents 700 California Primary MCL <br /> Toxicity 300 California Public Health Goal <br /> Taste and Odors 29 Taste and Odor Threshold <br /> Toluene Chemical Constituents 150 California Primary MCL <br /> Toxicity 150 California Public Health Goal <br /> Taste and Odors 42 Taste and Odor Threshold <br /> Xylenes(sum of Chemical Constituents 1750 California Primary MCL <br /> isomers) Toxicity 1800 California Public Health Goal <br /> Taste and Odors 17 Taste and Odor Threshold <br /> Diesel or Kerosene Toxicity 56 to 140 USEPA Superfund Provisional Reference <br /> Dose <br /> Taste and Odors 100 Taste and Odor Threshold <br />